Fe2O3 nanoparticles-decorated MoO3 nanobelts for enhanced chemiresistive gas sensing

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

“…The porous MoO 3 /SnO 2 nanoflakes with n-n junctions was also reported to show an improved gas sensing property with a higher gas sensor response being 43.5 towards 10 ppm H 2 S at 115 • C compared with that of the pure SnO 2 , which could also be attributed to the reasons mentioned previously (see Figure 7a1,a2) [120]. Moreover, the improvement in the H 2 S or xylene sensing performance of TiO 2 -decorated α-Fe 2 O 3 nanorods [121] or Fe 2 O 3 nanoparticles-decorated MoO 3 nanobelts [122] could also be explained by the enhanced gas sensing mechanism above.…”

“…The porous MoO3/SnO2 nanoflakes with n-n junctions was also reported to show an improved gas sensing property with a higher gas sensor response being 43.5 towards 10 ppm H2S at 115 °C compared with that of the pure SnO2, which could also be attributed to the reasons mentioned previously (see Figure 7a1,a2) [120]. Moreover, the improvement in the H2S or xylene sensing performance of TiO2-decorated α-Fe2O3 nanorods [121] or Fe2O3 nanoparticles-decorated MoO3 nanobelts [122] could also be explained by the enhanced gas sensing mechanism above. In the case of sensors based on n-p heterojunctions, the NiO-decorated Nb 2 O 5 nanocomposites have been reported to exhibit a significant improvement in the H 2 gas sensing performance compared with that of the pure Nb 2 O 5 nanoparticles [123].…”

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

“…The results in the literature to enhance/modify the gas response and/or selectivity using oxide–oxide heterostructures or heterocomposites are summarized in Table 3 . [ 214,216,223–327 ] The tailoring of gas sensing characteristics by the loading/doping of noble metal catalysts such as Pt, Pd, Au, Ag, and Rh on oxide semiconductors was not investigated in this review because it has been intensively studied before. [ 328–338 ]…”

Advances in the designs and mechanisms of MoO3 nanostructures for gas sensors: a holistic review

“…Moreover, the gas sensors made of these 1-D nanostructures offer ultra-sensitivity, fast response, higher stability, low-temperature operations, and less power consumptions 101,102 . Till date, variety of 1-D nanostructures including nanobelts 60,72,73,96,99,[101][102][103][104][105] , nanoribbons 56,59,100,106,107 , nanorods 74,75,97,[108][109][110][111][112][113] , nanofibers 76,114 , nanowires 82 and microrods 98,115,116 of MoO3 have been utilized in gas sensors and the following section summarize about these nanostructures with their gas sensing performance and mechanism. An overview of gas sensors based on 1-D MoO3 nanostructures is listed in Table 1.…”

“…Xylene is one of the toxic and colorless VOC whose over exposure results in cardiovascular and kidney problems. To detect the xylene, the formation of n-n heterostructures is one of the novel approach, following which the group of Qu et al 104 had detected xylene gas by preparing an n-n type heterostructure comprising of Fe2O3 NPs and MoO3 NBs by a two-step HT method. The morphological analysis results in Figure 2a, and 2b shows that the MoO3 NBs are ~200-300 nm in width while ~2-3 mm in length, and also the nanobelt structure of MoO3 was retained even after uniformly doping of Fe2O3 NPs (Figure 2c and 2d).…”